Lock



A. K. ALEXAVDER AND B, MORGENTHAU;

LOCK.

APPLICATION FILED DECJ30,1920.

Patented Au 22, 1922.

2 SHEETS-SHEET I.

aa QZMWAM VGIQIVENTORS 3A] BY ATTORNEY A. A. ALEXANDER AND B. MORGENTHAU. LOCK.

APPLICATION men DEC. 30, 1920.

1,426,8U5. Patented Aug. 22, 1922.

2 SHEETSSHEET 2.

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3 INVENTORS BY ATTORNEY ARTHUR A. ALEXANDER AND BERNARD J TOBGENTHAU, OF NEW YORK, N. Y,

LOCK.

Application filed December 30, 1920.

To all whom it may concern:

Be it known that we, ARTHUR A. ALEX- ANDER and BnnNAnn Monenu'rrrsu, citizens of the United States, and residents of the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Locks, of which the following is a specification.

The present invention relates to improvements in looks, and has for its general object to provide a door lock in which, preferably, arc-shaped locking bolts are employed, said bolts being swung into engagement with the keeper on the door by a sliding plate, which is controlled by one or more tumblers.

Another object of the invention is to provide a lock of the character mentioned, which is simple in construction, efiicient operation, and which it is practically impossible to pick either by skeleton or false keys or by sharp pointed instruments.

A further object of the invention is to so construct the lock casing that the locking bolts cannot be cut by saws or similar tools inserted from the outside between the door jam'b and the door proper. I

A still further object of the invention is to produce a lock of the character mentioned, which-is capable of manufacture on a commercial scale, or in other words one which is not so difiicult to make as to be beyond the reasonable cost of such a device.

lVith these and other objects in view, which will more fully appear as the nature of the invention is better understood, the

' same consistsin the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that many changes may be made in thesize and pro portion of the several parts and details of construction within the scope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the invention] One of the ma y possible embodiments of the invention is illustrated in the accompanying drawings, in which Figure 1 represents a rear elevation of the lock, partly in section, with the back plate removed to show its interior mechanism, the locking bolts being in their projected positions; Fig. 2 is a similar elevation with the locking bolts in their retracted. positions;

Specificationof Letters Patent.

Patented Aug. 22, 1222.

Serial No. 434,055.

Fig.- 3 is a section taken on line 38 of F 1g. 2; F 1g. 4: is a perspective view of one of the locking bolts; Fig. 5 is a section taken through the lreyand hand-operated lock actuating mechanism; Fig. 6 is a front elevation of a portion of the lock; Fig. 7 is a section taken on line 77 of Fig. 6 of the faceplate of the lock and certain elements carried thereby; and Fig. 8 is a top elevab10110]? a portion of the lock and its keeper.

In the drawings, the numeral 10 indicates alock casing, mounted in any suitable manner upon the inner face of the door 11., in alignment with a keeper 12 on the jamb 13. The lock casing is provided in its end plate 14 with two apertures 15, into which project substantially arc-shaped locking bolts 16, provided with arms 17, the latter extending radially to said locking bolts and being pivoted at'lS to the face plate 19 of the lock casing. This face plate is, preferably, made integral with the lock casing, while its back plate 20 is detachable therefrom, said back plate abutting against ledges 21 in the lock casing and being held thereonby a screw passing into a post 22. This post is mounted up'onthe face plate 19 and extends at right angles to the said face platea substantial distance in' rear of the pivot pin 18 above referred to. Each locking 'bolt is provided adjacent'its inner end with a projection 23,

adapted to abut against the inner face of the face plate 14 (Fig. 1), to limit the outward movement of the bolt. With the locking bolts co-operates a sliding plate 23,

mounted within the lock casing between guides 24 upon the face plate 19 and prothe sliding plate.

The sliding plate is movable in the direction of the longitudinal axis of the lock casing, and is controlled by a tumbler 29, whlch is carried by the said sliding plate and is movable thereon in a direction at right angles to the direction of movement of the sliding plate. For this purpose, there are provided on the said sliding plate two head ed studs 30, extending through slots. 31 in the tumbler. These slots extend at right.

angles to the longitudinal axis of the lock casing, thereby permitting of the proper movement of the tumbler. On the tumbler formed a shoulder 32, co-acting with the post 22 and being continuously held in engagement therewith by a spring 33 on the tumbler. This spring bears against the innor face of the lock casing. When the shoulder 32 is in engagement with the front face of the post 22 (Fig. 1), it prevents the retraction of the locking bolts, and, when in engagement with the rear face of said post (Fig. 2), it prevents the bolts from being projected into the keeper 12.

For actuating thesliding plate and tnnr bler, two cams 34 and 35 are provided, either made integral with or fixed to an enlarged hub portion 36, through which extends slidably a spindle 37, the latter carrying a pin 38, that is seated in a slot 39 in the said hub. This spindle is rotatably mounted in the face plate of the lock casing and carries. outside of the said casing, a thumb-piece or knob 40. The spindle is shiftable in the direction of its longitudinal axis upon said face plate and is controlled by a spring 41, which has a tendency to seat the said pin in a slot 42 in a disk 43. This disk is rotatably mounted uponthe back plate 20 of the lock and is provided with a recess 44, in which is seated the projection upon a key plug 46, mounted and adapted to turn in a cylinder 4'7. so-called cylinder look, a detailed description of which is not necessary as it is well known and does not form part of the pres ent invention. The key is inserted into the key plug fromthe outside, the plug being fixed, that is to saynon-rotatable, in case the key is withdrawn therefrom, as usual in constructions of this type. i

As mentioned above, the spindle 37 is shiftable in the direction of its longitudinal axis upon the face plate 19, upon the outer face of which is shiftably disposed a catch 48, which may be interposed between the thumb piece 40 and the face plate 19, to hold the spindle in its outer position, in which its pin 38 is disengaged from the slot 42 in the disk 43.

The keeper 12 is made in the form of a casing. in the end plate 49 of which are provided openings .50, in alignment with the apertures 15 in the end plate 14 of the lock casing, when the door is in its closed position. From the end plate 49 projects inwards an arc-shaped shoulder 51, engaging the locking bolts when in their projected positions.

The operation of the elements so far de scribed is as follows In the positions of the elements shown in Fig. 1 of the drawings, the locking bolts are shown in their projected positions,- in which the shoulder 32on lthe tumbleris disposed inf-rout of the This plug and cylinder form part of a post 22, being held in engagement with the front face of the said post by the spring 33. The bolts are thus prevented from being forced inwardly by pressure against their outer ends, such as by a thin instrument insorted between the lock casing and the keeper. When the catch 48 is disengaged from the thumb piece 40, as shown inFigs. 5 and 7 of the drawings, the pin 38 is seated in the registering slots in the cam hub 36 and disk 43. l Vith the elements in these positions, the door is unlocked from the outside by inserting the proper key into the plug 46 and turning the latter in the required direction, the rotation of the plug being transmitted to the cams 34 and 35 by the intermediary of the pin 38. As the said cams are rotated in the direction of the arrow shown in Fig. 1 of the drawings, first, the cam 35 raises the tumbler 29, disengaging its shoulder 32' from the post 22, and then, in the furtherrotation of the said cams, the cam 34 engages aprojection 52 on the sliding plate 23, moving the said sliding plate with the tumbler rearwards, thus causing the pins 26 to retract the locking bolts. The door is thus adapted to be opened in the usual'manner. It is to be noted that, as soon as the shoulder 32 has moved sufficiently,rearwards, the spring 33 shifts the tumbler so that the said shoulder engagesthe rear face of the post 22 (Fig. 2).

in order to unlock the door from the inside with the elements in. the positions shown in Fig. 1 of the drawings, the spindle 37 must first be moved outwards and the catch 48 interposed between the thumb piece 40 and the face plate 19, to hold the pin 38 disengaged fromthe disk 43. "If new the thumb piece is rotated in the proper direction, the locking bolts will be disengaged from the keeper in the manner above described. It is to be observed that, when the catch 43' is interposed between the thumb piece and face plate of the lock, the door cannot be unlocked from the outside, as

there isno driving connection between the disk 43 and the cam hub 36', the pin 38 being wholly withdrawn from the slot 42 in the said disk.

In order to project the locking boltsinto the keeper, obviously the cams must be rotated in the opposite direction. in which again, first, the tuinbler is raised by the cam 35 and then the sliding plateshifted by the cam 34, the latter acting against a shoulder on the sliding plate 23. In shifting the sliding bolt forward, the pins 27 cause'the locking boltsto swing around their pivot into the keeper. The projected position of the locking bolts is determined by the proj ections 23' on the locking bolts; When these locking bolts are in their projected positions,

the shoulder 32 on the tumblerabuts against the front face of the post 22, asabovestated.

In order to prevent the looking bolts from being cut by saws or simllar tools, which may be inserted from the outslde between the door amb and the door, there are provided upon the lock casing, for engagement with the upper and lower faces of the keeper, casing-like projections 54, extending over the said keeper and containing each a plurality of steel balls 55, overlapping the gap between the lock casing and keeper. If, therefore, a saw is inserted between the door jan'ib and door, it will be possible to out part oi the casing-like projections 54, but, as soon as the saw teeth engage the steel balls 55, they will be revolved by the reciprocating saw and prevent any further cutting action. The saw will thus never reach the locking bolts, nor the lock-casing proper.

The juxtaposed faces 56 and 57 of the lock casing and keeper, respectively, are somewhat"curved (Fig. 8), thereby preventing the insertion of a saw, etc., to cut the bolts.

The balls 55 may be made use of to protect the lock casing itself or other receptacles by mounting the same upon the inner faces of the walls of the casing or other receptacle.

What we claim is 1. The combination with a lock casing, of a keeper in operative relation thereto, a hollow body on said casing projecting over the gap between said casing and keeper, and

a plurality of balls loosely mounted in said body.

2. The combination with a lock casing, of a locking bolt therein, a hollow body on said casing extending over the bolt when the latter is in its projected position, and a plurality of balls loosely mounted in said body.

3. The combination with the wall of a receptacle, of a plurality of balls loosely mounted on the inner face thereof, said balls being held against the inner face of said wall.

Signed at New York, in the county of ARTHUR A. ALEXANDER. BERNARD MORGENTHAU. 

